Hydraulic brake apparatus

A hydraulic brake apparatus, comprising:

• a master cylinder pressurizing brake fluid in a pressure chamber by movement of a master cylinder piston to generate hydraulic pressure in response to an operation stroke of a brake operation member and outputting the hydraulic pressure to a wheel cylinder of a first brake circuit;
• a pressure control valve controlling a hydraulic pressure of an auxiliary hydraulic pressure source in response to the hydraulic pressure in the pressure chamber and outputting the controlled hydraulic pressure to a wheel cylinder of a second brake circuit;
• the master cylinder piston including:
• a sleeve positioned in a hole in the master cylinder piston;
• a first passage in the master cylinder piston which opens into the hole and hydraulically connects the pressure chamber and a reservoir;
• and a switching valve which closes the first passage when the master cylinder piston moves in a forward direction of pressurizing and which opens the first passage when the master cylinder piston returns in a rearward direction opposite the forward direction;
• a check valve which allows the brake fluid to travel only from the reservoir to the pressure chamber;
• a clearance between an outer surface of the sleeve and an inner surface of the hole in the master cylinder piston, the clearance forming a throttle;
• and
• the throttle being hydraulically provided in parallel with the check valve at the first passage at a position between the switching valve and the reservoir.